类的继承关系.doc

第 八 周实验学号 20082433 姓名 张立健 专业 网络工程 一、已完成实验（仿照下面给出本次实验的所有内容）实验一1、实验内容 阅读如下所示的3个Java类的定义，分析它们之间的关系，写出运行结果。 2、程序运行结果（给出编译、运行的截图） 3、程序清单 class SuperClass int x; SuperClass() x=3;System.out.println(in SuperClass : x= +x); void doSomething() System.out.println(in SuperClass.doSomething(); class SubClass extends SuperClass int x; SubClass() super(); / 调用父类的构造方法 x=5; / super( ) 要放在方法中的第一句 System.out.println(in SubClass :x=+x); void doSomething( ) super.doSomething( ); / 调用父类的方法 System.out.println(in SubClass.doSomething(); System.out.println(super.x=+super.x+ sub.x=+x); public class TestDemo public static void main(String args) SuperClass sup=new SubClass(); sup. doSomething(); SubClass sub = new SubClass(); sub.doSomething(); 实验二.一 1、实验内容：编写程序并验证。 2、程序运行结果（给出编译、运行的截图） 3、程序清单/EmployeeTest.javaimport java.util.*;public class EmployeeTest public static void main(String args) / 将三个员工对象的数据赋值给职工数组 Employee staff = new Employee3; staff0 = new Employee(张三, 75000,1987, 12, 15); staff1 = new Employee(李四, 50000,1989, 10, 1); staff2 = new Employee(王五, 40000,1990, 3, 15); for (int i = 0; i staff.length; i+) staffi.raiseSalary(5);/每个员工的工资增长5% for (int i = 0; i staff.length; i+)/ 打印输出员工信息 Employee e = staffi; System.out.println(姓名= + e.getName() + ,工资= + e.getSalary() + ,工作日期= + e.getHireDay(); class Employee private String name; private double salary; private Date hireDay; public Employee(String n, double s, int year, int month, int day) name = n; salary = s; GregorianCalendar calendar = new GregorianCalendar(year, month - 1, day); / GregorianCalendar 计算月份从0开始 hireDay = calendar.getTime(); public String getName() return name; public double getSalary() return salary; public Date getHireDay() return hireDay; public void raiseSalary(double byPercent) double raise = salary * byPercent / 100; salary += raise; 实验二.二 2.实验运行结果：3.实验源代码：import java.util.*;public class ManagerTest public static void main(String args) / 创建一个新的经理并设置他的奖金 Manager boss = new Manager(陈鹏, 80000, 1987, 12, 15); boss.setBonus(5000); Employee staff = new Employee3; / 建立员工数组和经理一起填充 staff0 = boss; staff1 = new Employee(何恒, 50000, 1989, 10, 1); staff2 = new Employee(童同, 40000, 1990, 3, 15); / print out information about all Employee objects for (int i = 0; i 0 ? s : 0 ); / 确定Boss的薪水 public double earnings() return weeklySalary; / 打印姓名 public String toString() return 经理: + super.toString(); public static void main(String args) Boss boss=new Boss(li,lei,2000); System.out.println(name= + boss.toString()+ ,salary= + boss.earnings(); 实验三 1、实验内容：假定根据学生的6门学位课程的分数决定其是否可以拿到学位，对于本科生，如果6门课程的平均分数超过60分即表示通过，而对于研究生，则需要平均超过80分才能够通过。根据上述要求，请完成以下Java类的设计：（1）设计一个基类Student描述学生的共同特征。（2）设计一个描述本科生的类Undergraduate，该类继承并扩展Student类。（3）设计一个描述研究生的类Graduate，该类继承并扩展Student类。（4）设计一个测试类StudentDemo，分别创建本科生和研究生这两个类的对象，并输出相关信息。2、程序运行结果（给出编译、运行的截图） 3、程序清单class Student public String studentNumber; public String classNumber;public String studentName;public String studentSex;public int studentAge;public Student(String a,String b,String c,String d,int e) studentNumber=a; classNumber=b; studentName=c; studentSex=d; studentAge=e;public String toString() String s=studentNumber:+studentNumber+nsudentName:+studentName+nclassNumber:+classNumber+nstudentSex:+studentSex+nstudentAge:+studentAge; return s;class Undergraduate extends Studentdouble score;Undergraduate(String a,String b,String c,String d,int e,double scores) /*studentNumber=a; classNumber=b; studentName=c;studentSex=d; studentAge=e;*/ super(a,b,c,d,e); this.score=new double6; for(int i=0;i6;i+) scorei=scoresi; public void pass() double average,scoresum=0; for(int i=0;i=60) System.out.println(该生通过！); else System.out.println(该生未通过！);class Graduate extends Studentdouble score; Graduate(String a,String b,String c,String d,int e,double scores) /*studentNumber=a; classNumber=b; studentName=c;studentSex=d; studentAge=e;*/ super(a,b,c,d,e); this.score=new double6; for(int i=0;i6;i+) scorei=scoresi; public void pass() double average,scoresum=0; for(int i=0;i=80) System.out.println(该生通过！); else System.out.println(该生未通过！);public class StudentDemopublic static void main(String args) double b=new double6;double y=new double6;b0=58.0;b1=78.0;b2=94.0;b3=65.0;b4=49.0;b5=60.0;y0=90.0;y1=85.0;y2=96.0;y3=87.0;y4=91.0;y5=90.0;Undergraduate u=new Undergraduate(20082433,class2,zhanglijian,nv,22,b);Graduate g=new Graduate(20081019,class1,caizhanwang,nan,24,y);System.out.println(the undergraduate basic information :+u.toString();u.pass();System.out.println(the graduate basic information:+g.toString();g.pass();实验四1. 实验内容：2. 实验运行结果： 3. 实验源代码： abstract class Shape double length1;abstract double getArea();abstract void displayArea();class Trangle extends Shapedouble length2;double s;Trangle(double a,double b) this.length1=a; this.length2=b;double getArea()s=length1*length2; return s;public void displayArea() System.out.println(the area of the trangle is:+getArea();class Triangle extends Shapedouble high;Triangle(double a,double b)this.length1=a;this.high=b;double getAr